public class EncryptAndDecrypt {
    String encrypt(String sourceString ,String password){
        char [] p=password.toCharArray();
        int n=p.length;
        char [] c=sourceString.toCharArray();
        int m =c.length;
        for (int k=0;k<m;k++){
            int mima=c[k]+p[k%n];
            c[k]=(char)mima;
        }
        return new String(c);
    }
    String decrypt(String sourceString ,String password){
        char [] p=password.toCharArray();
        int n=p.length;
        char [] c=sourceString.toCharArray();
        int m =c.length;
        for (int k=0;k<m;k++){
            int mima=c[k]-p[k%n];
            c[k]=(char)mima;
        }
        return new String(c);
    }
}
